• Structure of Atom (Class IX)
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Structure of Atom (Class IX)

Description: Chemistry
Number of Questions: 15
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Tags: Chemistry Science IX Structure of the Atom Structure of The Atom Canal Rays, Discovery of neutron, Characteristics of neutrons Thomson-s Model of Atom Rutherford-s Model of Atom Bohr-s Model of an Atom Tritium
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J. J. Thomson was awarded the Nobel Prize for Physics for his work on the discovery of electrons. Which of the following was/were suggested by Thomson in his model of atom?

  1. An atom consists of a positively charged sphere and the electrons are embedded in it.

  2. An atom consists of a negatively charged sphere and the electrons are embedded in it.

  3. The negative and positive charges are equal in magnitude.

  4. Both (1) and (3)

  5. Both (2) and (3)

Show answer
Correct Option: D
Explanation:

This is correct as both are suggested in Thomson's model of atom.

Who discovered neutrons?

  1. J. J Thomson

  2. John Dalton

  3. Ernest Rutherford

  4. Eugen Goldstein

  5. James Chadwick

Show answer
Correct Option: C
Explanation:

This is the correct answer. James Chadwick discovered neutrons.

Which of the following is incorrect about the nucleus?

  1. It is the central part of an atom.

  2. It is neutral in charge.

  3. All protons and neutrons are present in this region.

  4. It is 105 times smaller than the size of the atom.

  5. None of these

Show answer
Correct Option: B
Explanation:

This is incorrect as it is positively charged.

The atomic number of an element signifies the number of

  1. protons in the nucleus

  2. electrons in the nucleus

  3. electrons in the extranucleur part

  4. protons in the extranucleur part

  5. electrons and protons in the nucleur part

Show answer
Correct Option: A
Explanation:

This is the correct answer as the atomic number of an element signifies the number of protons.

Which of the following elements does not contain any neutron?

  1. Helium

  2. Krypton

  3. Oxygen

  4. Hydrogen

  5. Sodium

Show answer
Correct Option: D
Explanation:

This is the correct answer as a hydrogen atom does not contain any neutrons.

Which of the following particles determine the mass of an element?

a. Neutron b. Electron c. Proton

  1. a, b and c

  2. a and b

  3. b and c

  4. a and c

  5. only a

Show answer
Correct Option: D
Explanation:

This is the correct answer as protons and neutrons determine the mass of an element.

Isotopes are

  1. atoms of the same element

  2. atoms of different elements

  3. molecules of the same element

  4. radicals of the same element

  5. atoms with the same atomic mass

Show answer
Correct Option: A
Explanation:

This is the correct answer as isotopes are atoms of the same element.

Which of the following statements is incorrect for the 'model of atom' as proposed by Rutherford?

  1. There is a positively charged centre in an atom called the nucleus.

  2. Nearly all the mass of an atom resides in the nucleus.

  3. The electrons revolve around the nucleus in circular paths.

  4. Nucleus contains protons and neutrons.

  5. The size of the nucleus in the atom is very small.

Show answer
Correct Option: D
Explanation:

This is the correct answer choice as Rutherford did not draw this conclusion based on his model of the atom.

Which of the following isotopes is/are paired incorrectly with its/their application?

a. Uranium - fuel in nuclear reactors b. Cobalt - treatment of cancer c. Iodine - determining age of old wooden objects

  1. a only

  2. b only

  3. c only

  4. a and b

  5. b and c

Show answer
Correct Option: C
Explanation:

This is the correct option as an isotope of iodine is used in the treatment of goitre. An isotope of carbon, carbon-14 is used in determining the age of old wooden objects.

Which of the following postulates were put forward by Neils Bohr about the model of an atom?

a. Only certain special orbits known as discrete orbits of electrons, are allowed inside the atom. b. While revolving in discrete orbits, the electrons do not radiate energy. c. The orbits or shells are called energy levels.

  1. a, b and c

  2. a and b

  3. b and c

  4. only a

  5. only c

Show answer
Correct Option: A
Explanation:

This is the correct answer as all the given postulates were put forward by Neils Bohr about the model of an atom.

Which of the following is/are the isotopes of hydrogen atom?

a. Protium b. Deuterium c. Tritium d. Actinium

  1. a and b

  2. b and c

  3. c and d

  4. a, b and c

  5. b, c and d

Show answer
Correct Option: D
Explanation:

This is the correct answer as protium, deuterium and tritium are the isotopes of hydrogen.

Which of the following is/are correct about canal rays?

a. They are positively charged radiations. b. They are negatively charged radiations. c. J. J. Thomson discovered the presence of canal rays in a gas discharge.

  1. a and c

  2. b and c

  3. only a

  4. only b

  5. only c

Show answer
Correct Option: C
Explanation:

This is the correct answer as canal rays are positively charged radiations.

Which of the following statements is/are correct?

a. An atom is divisible and consists of charged particles. b. E. Goldstein identified the electron. c. The mass of an electron is considered to be negligible and its charge is minus one.

  1. a only

  2. b only

  3. c only

  4. a and c

  5. a, b and c

Show answer
Correct Option: D
Explanation:

This is the correct answer as these statements are correct.

Which of the following statements is/are correct about the characteristics of an atom?

a. Atoms are electrically neutral. b. Nucleus of an atom is positively charged. c. The protons and neutrons in a nucleus rearrange themselves due to emission of y-rays.

  1. a only

  2. b only

  3. c only

  4. a and b

  5. a, b and c

Show answer
Correct Option: D
Explanation:

This is the correct answer as both statements are correct. Atoms are electrically neutral because they have equal numbers of protons (positively charged) and electrons (negatively charged). Because neutrons have no charge and protons have positive charge, the overall charge of the nucleus is positive.

Which of the following is not a characteristic of cathode rays?

  1. They travel in straight lines.

  2. They are deflected towards negative plate, thus showing electrons.

  3. They ionise the gas through which they pass.

  4. They can penetrate through thin metallic sheet.

  5. They can produce X-rays.

Show answer
Correct Option: B
Explanation:

This is the correct answer as this is incorrect about cathode rays. They are deflected towards positive plate, thus showing that these are negatively charged particles known as electrons.

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